.box{
    background: black;
   
    .video_box{
        position: relative;
        width: 100%;
        height: 100%;
        .video{
            width: 100%;
            position: absolute;
            left: 0;
            bottom: 0;
            top: 0;
            right: 0;
            margin: auto;
        }
        .text{
            position: absolute;
            color: white;
            top:70%;
            font-size: 80px;
            padding-left: 20px;
        }
        .text2{
            color:white;
            position: absolute;
            font-size: 20px;
            padding-left: 20px;
            top: 82%;
        }
        .pro_box{
            height: 80px;
            width: 100%;
            background: white;
            position: absolute;
            bottom: 0;
            .progress{
                height: 100%;
                width: 0px;
                background: deepskyblue;
            }
            .pre{
                position: absolute;
                font-size: 70px;
                left: 0;
            }
            .player{
                position: absolute;
                left: 50%;
                transform: translate(-50%);
                font-size: 70px;
                
            }
            .next{
                position: absolute;
                right: 0;
                font-size: 70px;
            }
        }
        
    }
    .mask{
        height: 100%;
        width: 100%;
        position: fixed;
        left: 0;
        top: 0;
        display: none;
        background: rgba(30, 150, 205, 0.98);
        h2{
            padding-left: 5%;
            font-size: 18px;
            color: white;
            padding-top: 5%;
        }
        .mask_box{
           height: 150px;
           width: 80%;
           position: absolute;
           left: 0;
           right: 0;
           bottom: 10%;
           top: 0;
           margin: auto;
           .continue{
               height: 150px;
               width: 150px;
               border-radius: 50%;
               background: #79f0c2;
               color: white;
               font-size: 20px;
               .c_text{
                   font-size: 60px;
               }
           }
           .endtrain{
               height: 150px;
               width: 150px;
               border-radius: 50%;
               background: #ff6060;
               color: white;
               font-size: 20px;
               .end_t{
                   font-size: 60px;
               }
           }
        }
        .box3{
            height: 150px;
            width: 80%;
            position: absolute;
            border: 1px solid white;
            left: 0;
            right: 0;
            bottom: 0;
            top: 40%;
            margin: auto;
           .b3_left{
               width: 50%;
               height: 100%;
               background: white;
           }
           .b3_right{
               width: 50%;
               height: 100%;
               background: rgba(0,0,0,0);
               color:white;
           }
        }
    }

}